#include<stdio.h>
int main(int argc, char const *argv[])
{
        int a,i,m;
        printf("There are following perfect numbers smaller than 1000:\n");
        for(a=1;a<1000;a++)
        {
            for(m=0,i=1;i<=a/2;i++)
                if(!(a%i))m+=i;
            if(m==a)
                printf(" %4d",a);
        }
    return 0;
}
